Presented by Curt Corum, Technical Sales Manager Air Handling Systems 5 Lunar Drive Woodbridge, CT 06525 Phone: 203.389.9595 www.airhand.com Copyright © 2017 Air Handling Systems. All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of Air Handling Systems. The Proper 3 are the key for Successful Dust Control! 1. Piping for a Central Dust Collection System. 2. Hooding Table Saw 3. Dust Collectors Woodshop Dust Control 2 Piping – Galvanized Spiral Pipe • Compared to non-round duct, Spiral Pipe has better rigidity, keeps air velocity more uniform to avoid settling of material, and provides for lower friction loss. • Spiral Pipe – withstands vacuum due to exterior spiral support. Airtight, excellent for industrial exhaust, longer lengths. • Snap Lock Pipe – NOT designed for vacuum, Meant to be “blow through,” shorter lengths. Allowable Negative Pressures in Round Spiral Pipe Diameter 0”-10” W.G. 10”-20” W.G. 3”-7” 26 Ga. 26 Ga. 8” 26 Ga. 26 Ga. 9”-12” 24 Ga. 24 Ga. 13”-15” 24 Ga. 22 Ga. 16”-18” 22 Ga. 20 Ga. 19”-22” 22 Ga. 18 Ga. 24”-26” 20 Ga. 18 Ga. Woodshop Dust Control 3 Piping - Elbows 1.5 diameter C.L.R. 1.5 diameter C.L.R. 2.5 diameter C.L.R. Die Formed Smooth Gored Gored (PREFERRED) (ACCEPTABLE) (ACCEPTABLE) Flat Back Mitered Heating PVC Short (SPECIAL) (AVOID) Short Radius Radius (AVOID) (AVOID) C.L.R. = Center Line Radius Woodshop Dust Control 4 Piping - Reducing Fittings FABRICATED SPUN Tapered Reducer Tapered Reducer Flat Reducer Eccentric Reducer (AVOID) (AVOID) Woodshop Dust Control 5 Piping - Junction Fittings 45O Tee on Taper 45O Reducing Lateral 90O Tee on Taper (PREFERRED) (Acceptable) (AVOID) 45O Lateral 90O Bull Head Tee 45O Double Cross (PREFERRED) (AVOID) Reducing Lateral (AVOID) 45O Double Cross Tee on Taper (PREFERRED) Boot Tee Woodshop Dust Control 6 Piping - Junction Fittings Y-Branch Reducing Y-Branch (AVOID) • All branches should enter the main at a maximum of a 45O angle. • To minimize turbulence and possible material fall out, branches should enter the side or top of the main duct. • The duct in a tapered system gradually gets larger as additional branches are merged together, therefore keeping duct velocities nearly constant. Woodshop Dust Control 7 Piping - Flexible Hose Rubber (RFH) - Cost effective; Relatively smooth bore, does not develop static like PVC; Recommended for saws, shapers, jointers; Outdoor Use, Chemically Bonded. Polyester Encapsulated in Thermoplastic Rubber - Flame Retardant; Mild abrasion; Indoor Use; General Purpose. Urethane - Abrasion resistance, Puncture Resistance, & Tear Strength. Relatively smooth bore. Outdoor use. Recommended for CNC Routers. Available in various mil thickness, 20 mil, 30 mil, 45 mil, 60 mil Wear Strip Option - Protect Exterior of hose; Recommended for hose that will lay on or be dragged over floor. Also available in METRIC - Metric size has been developed to meet the needs of imported machinery. Tip - Keep flex hose to minimum, it has three (3) times the drag (resistance) as straight pipe and it is as much as five (5) times the cost. Remember, it is a wearable item. Piping - Flexible Hose - QFD Woodshop Dust Control 8 Piping - Blast Gates Full Gate - Installs between pipe or pipe and flex hose. Use in NEW installations. Positive shutoff. Used for Balancing. Diverts suction from one line to another. Half Gate - Saw Cut Halfway around pipe (1/4” wide). Fasten to outside of pipe. Installs easy on existing pipe run. Good for paper trim, Moist or sticky materials. Not a completely positive shut off. Self Cleaning Gate - Installs between pipe or pipe and flex hose. Positive shut-off. Use for conveying moist or sticky material. Use if gate mounted in a horizontal run. Blast gate Connector (BC) - Pop rivet to outside of gate collar. Slip flex hose over and clamp. Woodshop Dust Control 9 Piping - Floorsweep At clean-up time, open gate on top of Floorsweep. Close Blastgates on machinery and divert suction to Floorsweep drop. IMPORTANT: Do not use on a system where debris hits the fan first. Starter Collar Tap to flat surface. Make your own hood. Hang dust bag from plenum. Bellmouth Tap to flat surface. Optimum flow fitting. Requires more space than Starter Collar. 45o Saddle Taps Ideal for tapping into EXISTING pipe runs. Woodshop Dust Control 10 Piping - Ball Joint Swivel Ball Joints are used for traversing machinery. Swivel Ball Joints with EXTENDED collar connects to flexible hose allowing free rotation. Many suppliers (manufacturers) provide ball joints with 1” long collars. Make sure you purchase with extended collars in order to properly secure your flex hose. Woodshop Dust Control 11 Piping - Connections Pipe-To-Pipe Fitting-To-Fitting Fitting-To-Pipe Connections Connections Connections Spiral pipes are connected Fitting-to-Fitting connections All fittings are sized to slip together by a sleeve type can be made by cutting a short into mating pipe sections or coupling (Part No. COUP). length of Spiral Pipe and using flex hose. No additional The coupling has a small- this length of duct as a female coupling will be needed. end and is slipped into the coupling or by ordering a type pipe sections. COU2 Female coupling. Woodshop Dust Control 12 Piping - Connections Welded Flanges Vanstone Flanges Welded flanges may be solid-welded or Slide ring over end of pipe, let 1/2" of pipe tack-welded and sealed with caulking. stick out. Use a clamp to hold the ring in Then connect flanges together with nuts place. Then use a ball peen hammer and & bolts peen over the 1/2" back to the ring. Clamp Together Uses barrel-type clamp ECS - Easy Connect Sleeve Draw band style with gasket Woodshop Dust Control 13 Piping - Airtight • Air Tight – It is critical that the piping used in a dust collection system is air tight. • All field connections must be sealed. • It is imperative that the system is air tight from the dust collector to the machinery. • Air tightness in conjunction with proper piping will optimize the dust collector’s performance capability. Piping - Pop Rivets vs. Screws Pop Rivets Screws Woodshop Dust Control 14 Piping - Hangers Beam Clamp Threaded Rod Heavy Duty Hanger Heavy Duty Hanger Heavy Duty Hanger with Strap with Threaded Rod Angle Strap out away from pipe on approx. 15 degree angle. This will prevent sway. Single Suspension Single Suspension Hanger Hanger with Strap Woodshop Dust Control 15 Hooding • Capture at the source • Try to encompass area where dust is being generated without interfering with the operation. Three important factors when designing a hood. 1. Shape of the Hood. It must be shaped to allow material to travel in a straight line to hood outlet without suction. Otherwise, angle of deflection is critical. (Note: Radial Saw Hood.) 2. Size of the Hood and it’s opening. Hood should be as small as possible, yet large enough to arrest the dust. The angles used in reducing the face opening to the outlet must not be too sharp or too flat. Angle of impact should not be more than 60 degrees. 3. Size of branch pipe and coinciding air volume will depend upon size of Hood and amount of waste being generated. Notes: • Make prototype Hoods out of heavy cardboard. Once the right Hood is developed, duplicate out of metal. • Volume required for a machine with a factory Hood will depend upon outlet diameter and branch velocity. Example: 4” diameter requires 350 CFM at 4,000 FPM branch velocity. • Hoods must be made large enough to cover all areas from which material could escape, but not any larger than necessary. The LARGER the Hood the more air volume required. Lengths of Hoods Too Short Too Long Proper Length Woodshop Dust Control 16 Hooding Types Slot Flanged Slot Plain Opening Flanged Opening Booth Canopy Plain Multiple Flanged Multiple Woodshop Dust Control 17 Hooding Examples Radial Arm Band Saw Saw Table Saw Single Drum Sander Woodshop Dust Control 18 Dust Collectors Dust Collectors - Single Stage Single stage dust collector (Blower and Filters ONLY) Dust Collectors - Two Stage • 2 stage dust collector (Cyclone, Blower and Filters) • Cyclone style with after filter • Used for large particles Woodshop Dust Control 19 Dust Collectors Bag Cartridge House Collector • Fine dust Cartridge Filtration - Fine Dust • Bags DO NOT clean as Pulse jets of clean air dislodge particles from the efficiently as cartridge unit filter cartridge. A timer activates compressed air to • Larger than Cartridge unit with clean filters on a continual basis. equal amount of filter area. Woodshop Dust Control 20 Dust Collectors - High Velocity Vacuum Portable High Velocity Vacuum with handheld sander • Hand held power tools with long small diameter hoses attached. • For central high velocity vacuum systems • High suction/low volume High Velocity Dust Collector Eurovac has two types of dust collectors for source capture dust extraction - Eurovac high volume/low vacuum systems for stationary equipment with take-offs larger than 2"and high vacuum/low volume systems to offset friction losses with small diameter hoses (1" to 2" vacuum hoses) High vacuum/low volume system for removing dust from hand tools like orbital and belt sanders, grinders, routers and a variety of saws including trim saws, hole saws, skil saws, radial saws and chop saws. www.eurovac.com Woodshop Dust Control 21 Dust Collectors - Dust Control Booth • Alternative to central high velocity vacuum systems • Cartridge filtration with air